From Cppreference
Returns true if non-recoverable error has occurred on the associated stream. Specifically, returns true if badbit is set in rdstate().
Parameters
(none)
Return value
true if a non-recoverable error has occurred, false otherwise.
Example
See also
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| checks if no error has occurred i.e. I/O operations are available (public member function)
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| checks if a recoverable error has occurred (public member function)
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| checks if end-of-file has been reached (public member function)
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| checks if an error has occurred (synonym of fail()) (public member function)
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